unable to show friends' name on chat

Question

I have problem to show the friend name on my chat. the apps force close every time run to show the friend\'s name. if i comment the part for friend\'s name, the messages can app

Answer 1

All your setText, Toast, etc... actions should be done in the UI thread.

For instance, stuff like: friendLabel.setText(name);

In order to fix that, I would suggest you to do that inside the onPostExecute:

    @Override
    protected void onPostExecute(JSONArray result) {
        updateUI();// Do whatever you want here
    }

From: http://developer.android.com/reference/android/os/AsyncTask.html

onPostExecute(Result), invoked on the UI thread after the background computation finishes. The result of the background computation is passed to this step as a parameter.

Answer 2

make the person name become dynamic

public void showPerson(String friendname, boolean leftSide) {
        final TextView textView = new TextView(ChatRoom.this);
        textView.setTextColor(Color.BLACK);
        textView.setTextSize(12);
        textView.setText(friendname);

        int bgName = R.id.meLabel;

        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

        if (!leftSide) {
            bgName = R.id.friendLabel;
            params.gravity = Gravity.RIGHT;
        }

        textView.setLayoutParams(params);

        textView.setId(bgName);

        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                messagesContainer.addView(textView);

                // Scroll to bottom
                if (scrollContainer.getChildAt(0) != null) {
                    scrollContainer.scrollTo(scrollContainer.getScrollX(), scrollContainer.getChildAt(0).getHeight());
                }
                scrollContainer.fullScroll(View.FOCUS_DOWN);
            }
        });
    }

so the json part become like this

                    if(!content.equals("null")){
                        try{
                            JSONArray jArr = new JSONArray(content);

                             // String messages="";
                              for(int i=0; i < jArr.length() ; i++){ 
                                  JSONObject jObj = jArr.getJSONObject(i);

                                     String name = jObj.getString("firstname");
                                     String message = jObj.getString("message");

                                     showPerson(name, false);
                                     showMessage(message, false);
                              }
                        }catch(JSONException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }